Essential Chemistry for IGCSE - Atoms, Elements And Compounds (Section 4 - No. 25)
If two atoms are isotopes, what must be true about them?
They have the same number of protons but different numbers of electrons.
They have the same number of neutrons but different numbers of protons.
They have the same number of protons but different numbers of neutrons.
They have different numbers of protons and neutrons.
Explanation
Isotopes have the same number of protons, and this defines the element, but different number of neutrons, which changes their mass.
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